Gas turbine braking apparatus and method

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 21/00 (2006.01) F01D 21/04 (2006.01) F02C 7/00 (2006.01) F02C 7/36 (2006.01) F16D 59/00 (2006.01)

Patent

CA 2577832

A braking apparatus (34) for an aircraft gas turbine engine (10), the engine having concentric first and second shafts (22, 26) with first and second turbine stages and first and second compressor stages respectively mounted thereto, the braking apparatus comprising an extension (44) with a frustoconical braking surface (50) at the rear end portion of the first shaft, and a complementarily shaped second braking surface (52) on a casing mounted member (38) that is movable towards the braking surface (50) by means of an actuator. The apparatus serves to a) stop rotation of de-coupled turbine rotor in the event of accidental shaft breakage or de-coupling during in-flight operation of the engine, b) selectively impede rotation of the first shaft to permit the second spool to generate power for use in ground operation without producing significant thrust, and c) selectively facilitate reduced aircraft ground taxiing speed.

Appareil de freinage (34) pour un moteur à turbine à gaz d'avion (10), la turbine ayant des arbres primaire et secondaire (22, 26) concentriques, sur lesquels sont montés respectivement les premier et second étages de la turbine et les premier et second étages du compresseur, l'appareil de freinage comprenant une extension (44) avec une surface de freinage (50) tronconique à l'extrémité arrière de l'arbre primaire et, sur un élément (38) monté sur le carter, une seconde surface de freinage (52) de forme complémentaire que l'on peut déplacer vers la surface de freinage (50) au moyen d'un actionneur. L'appareil sert à a) arrêter la rotation du rotor de turbine découplé en cas de rupture accidentelle de l'arbre ou de découplage pendant le fonctionnement en vol du moteur, b) empêcher de manière sélective la rotation de l'arbre primaire pour permettre au second corps de produire l'énergie qu'utilisent les opérations au sol sans engendrer de poussée notable et c) faciliter de manière sélective la réduction de la vitesse de l'avion quand il roule au sol.

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